Metro areas that produce a lot of patents—and the inventiveness that that implies—are more likely to see above-average gains in population, productivity, jobs, and education, according to a report from the Brookings Institution, a nonprofit research and policy think tank. And the bottom fourth of metro areas, the ones that produce the fewest patents, could gain as much as $4,300 per worker over a decade if they amped up their patent production to match the top fourth.

“If we were able to get the roughly 250 metropolitan areas that do very little patenting up to the level of the 100 that do a great deal of patenting, we’d be richer in an extraordinary way,” says Jonathan Rothwell, a lead researcher on the study. “It would make really a huge difference to economic development.”

These conclusions are unwarranted given the model and findings expressed in the paper. To see that this is the case, assume temporarily that patents do nothing to incentivize real innovation, and that they merely transfer wealth from consumers at large to the patent holder through firm profits. If this were the case, then we would find that measured output per worker was higher in metropolitan areas with more patents—exactly what the authors found!—because they are gaining profits at the expense of consumers in metropolitan areas with fewer patents. In other words, the authors could be laboring under a fallacy of composition. Just because patents enrich the MSAs that generate them doesn’t mean that they are a source of prosperity for the nation as a whole or that they increase social welfare.

Alternatively, assume temporarily that patents do nothing to incentivize real innovation, but that firms that produce valuable innovations must defensively patent them to avoid being taken to court for using their own inventions. If this were the case, then patents would correlate with real innovation, and therefore with output per worker, but they would not cause an increase in productivity. In addition, at least some of the measured increase in output would come from an influx of highly-paid intellectual property attorneys, which by assumption does not represent real added productivity. Note that the top-patenting MSA in the study is Silicon Valley, the part of the country where people are most concerned about defensive patenting. But the word “defensive” does not appear even one time in the report, the appendix, or the working paper.

The authors have done nothing to identify the effect of patents on productivity, which is to say, nothing to rule out either of the possible assumptions above. They are simply relying on the assumption that more patents means more innovation.

Right up front, I think it is important to keep in mind that our study aimed to examine the effects of invention rather than the effects of patents themselves. Hundreds of economic papers have been written that use patents as a proxy measure of invention (based on detailed firm and industry level analysis), so I think that is fairly uncontroversial.

Yesterday, Reuters news service ran an article about a rating of eleven countries based on their enforcement of intellectual property rights. The index was prepared at the behest of the U.S. Chamber of Commerce by a group called The Global Intellectual Property Center, and it ranks the U.S. at the top of the list in terms of strong IP protection (23.73 points on a scale from 0 – 25). But what is interesting is who scored lowest (out of the eleven countries that were ranked). The four “worst” countries for providing the strong IP protection important to the Chamber of Commerce were the four countries known as BRIC — Brazil, India, Russia and China.

So what else do we know about these four nations? In fact, why were they originally grouped together under the acronym BRIC? The answer is that the term was coined because these four countries were the fastest growing emerging economies, showing growth rates between 5 and 9 percent in their gross domestic products (compared with US growth averaging 3.2 over the past 65 years). The source of these averages for the BRIC nations is this report from PriceWaterhouseCoopers, dated February 2012, which contains this conclusion: “We expect the BRIC economies to continue to drive world economic growth in 2012.”

So the four countries driving economic growth are also the four countries with the weakest IP protection regimes, amongst those 11 rated by the Chamber of Commerce report. Doesn’t the conclusion seem simple, that weaker IP enforcement is part of the picture for economic growth?

[I]P protection is, at least a double edged sword. Piracy can reduce revenues, but it also helps to create distribution channels and grow markets. So creative industries seeking to grow in the digital economy need to do more than try, futilely, to eradicate piracy, they need to seek ways to shape their markets and their marketing to exploit the audiences that it can create.

So, slippery as such conclusions can be, I feel comfortable with these two assertions. First, creative people and creative industries can thrive without strong IP protections. In fact, if you are continually looking to the government to increase IP enforcement on your behalf, your industry is probably already in bad trouble. Second, it is perfectly possible to over-enforce IP rights to the point where creativity and economic growth are stifled. There is good evidence that the US has passed that point, and the example of the BRIC nations should suggest to us that we need to reverse our course.

People who start talking while driving become more cautious. People who act like jackholes behind the wheel with a cellphone will act the same without one. And although cellphones clearly distract some drivers, they may also help other drivers stay alert.